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<head>
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    <title>Title</title>

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<div  style="margin:0px；padding:0;background-color:green;opacity:0.5"> 
我是坨坨
</div>
<span  style="margin:0px；padding:0;background-color:red;opacity:0.5"> 
我是坨坨
</span>
<span  style="margin:0px；padding:0;background-color:red;opacity:0.5;font-size:10px;"> 
我是坨坨
</span>
<span  style="margin:0；padding:0;background-color:red;opacity:0.5;font-size:20px;"> 
我是坨坨
</span>
<span  style="margin:0；padding:0;background-color:yellow;opacity:0.5;font-size:50px;"> 
我是坨坨
</span>
</body>
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